added custom component template

src/frontend/tests/custom_component_full.ts

@@ -0,0 +1,20 @@
+export const custom = `from langflow import CustomComponent
+
+from langchain.llms.base import BaseLLM
+from langchain.chains import LLMChain
+from langchain.prompts import PromptTemplate
+from langchain.schema import Document
+from langchain.field_typing import NestedDict
+
+import requests
+
+class YourComponent(CustomComponent):
+    display_name: str = "Custom Component"
+    description: str = "Create any custom component you want!"
+
+    def build_config(self):
+        return { "file": { "file_type": ["json"], } }
+
+    def build(self, url: str,file:str,integer:int,nested:NestedDict,flt:float,boolean:bool,lisst:list[str],dictionary:dict, llm: BaseLLM, prompt: PromptTemplate) -> Document:
+
+        return "test"`;